When I urinate there are wormlike blood clots in my urine, my lower back hurts severely, and pain in my groin. What is wrong with me?

Hematuria. You should be evaluated by a urologist. Blood in the urine is never normal.
See your doctor. Gross painful hematuria requires a urological evaluation. You need proper imaging as well as cystoscopy to evaluate for problems of your kidneys ureters or bladder which may range from infections to stones to various tumors. See your doctor soon.

Related Questions

1 week of spotting, 2 weeks after my period and some blood clot with my urine. Lower back pain and little cramps on my lower body. No pills

UTI. I'm not sure that the spotting is related, but the other symptoms all sound like a urinary tract infection. Better see a doctor for a urinalysis and get some antibiotics (if i'm right). Read more...
Bladder infection. It could be a urinary tract infection. Causes of abnormal bleeding could be various ( obesity, ovarian cyst, pelvic inflamatory disease , pcos, pregnancy etc) have your docotor do a complete physical exam and labs. Read more...

Severe lower back pain and blood clots like marks. What could be the reason?

See a doctor please. A medicine, such as Aspirin or blood thinners (anticoagulants). Infection:buildup of toxin in the blood or tissues (sepsis). A bleeding or clotting disorder: hemophilia, von willebrand's disease, thrombocytopenia. Chronic inflammatory diseases, such as lupus. Liver disease, cirrhosis. Cancer, such as hodgkin's, leukemia, vasculitis... Read more...

I am experiencing heavy bleeding with huge blood clots cramping and lower back pain. Can this be a sign of miscarriage?

Yes. Sometimes a woman can miscarry without actually missing a period, since you didn't mention your period, i'm going to assume this might be the case with your question. Blood clots can mean miscarriage, can also mean excess estrogen or excess progesterone. Back pain often accompanies when there is a lot of blood going through the cervix or passage of clots. Read more...